How to remove GScaleControl ?

I am trying to use Google map for other professional purposes for FMCG
(fast moving consumer good) and medical, which is basically use the
framework to viewing a big picture. Google map will enable the scale
control as default for large map.

I tried to disable the control by following code from Google API
tutorial:
...
var customUI = map.getDefaultUI();
customUI.controls.scalecontrol = false;
map.setUI(customUI);
...

But it doesn't work, it still there and confuse our users.

Has anyone experienced that before? Thanks in advance.

BTW, I left my page on:

http://www.ennovation.org/test/dm-crop/

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